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Primary Standards Selection Guide

Primary Standards for Temperature Calibration

Primary Standards for Temperature Calibration

The defining instruments of the ITS-90 (International Temperature Scale of 1990) are Standard Platinum Resistance Thermometers (SPRT) and ITS-90 fixed point cells. SPRTs are calibrated in fixed point cells to provide the highest possible temperature accuracy. Primary standards offered by Fluke Calibration include Standard Platinum Resistance Thermometers, ITS-90 fixed point cells and all of the equipment and services necessary for calibration traceable to the ITS-90, including, furnaces, baths, resistance bridges, and standard resistors.

Standard Platinum Resistance Thermometers (SPRTs) 

Model  RTPW Description 
5681  25.5 Ω –200 °C to 670 °C, quartz sheath 
5683  25.5 Ω  –200 °C to 480 °C, quartz sheath  
5684  0.25 Ω 0 °C to 1070 °C, quartz sheath  
5685  2.5 Ω  0 °C to 1070 °C, quartz sheath  
5698  25.5 Ω  –200 °C to 670 °C, working standard, , quartz sheath  
5699  25.5 Ω –200 °C to 670 °C, high temperature, metal sheath
5686  25.5 Ω –260 °C to 232 °C, glass capsule

 

ITS-90 Fixed-point cells 

Model  Description  Temperature 

Triple point of water cells

5901A-G  TPW Cell, 12 mm ID with handle, glass shell  0.01 °C 
5901A-Q  TPW Cell, 12 mm ID with handle, quartz shell  0.01 °C 
5901C-G  TPW Cell, 13.6 mm ID with handle, glass shell  0.01 °C 
5901C-Q  TPW Cell, 13.6 mm ID with handle, quartz shell  0.01 °C 
5901D-G  TPW Cell, 12 mm ID, glass shell  0.01 °C 
5901D-Q  TPW Cell, 12 mm ID, quartz shell  0.01 °C 
5901B-G  TPW Cell, mini, glass shell  0.01 °C 

Standard size fixed-point cells

5900E  TP Mercury, SST  –38.8344 °C 
5904  Freezing Point of Indium  156.5985 °C 
5905  Freezing Point of Tin  231.928 °C 
5906  Freezing Point of Zinc  419.527 °C 
5907  Freezing Point of Aluminum  660.323 °C 
5908  Freezing Point of Silver  961.78 °C 
5909  Freezing Point of Copper  1084.62 °C 
5924  Open Freezing Point of Indium  156.5985 °C 
5925  Open Freezing Point of Tin  231.928 °C 
5926  Open Freezing Point of Zinc  419.527 °C 
5927A  Open Freezing Point of Aluminum  660.323 °C 
5928  Open Freezing Point of Silver  961.78 °C 
5929  Open Freezing Point of Copper  1084.62 °C 
5943  Melting Point of Gallium, SST  29.7646 °C 

Mini triple point of water and fixed-point cells

5901B  Mini Triple Point of Water  0.01 °C 
5914A  Mini Freezing Point of Indium  156.5985 °C 
5915A  Mini Freezing Point of Tin  231.928 °C 
5916A  Mini Freezing Point of Zinc  419.527 °C 
5917A  Mini Freezing Point of Aluminum  660.323 °C 
5918A  Mini Freezing Point of Silver  961.78 °C 
5919A  Mini Freezing Point of Copper  1084.62 °C 
5944  Mini Freezing Point of Indium, Metal Cased 156.5985 °C 
5945  Mini Freezing Point of Tin, Metal Cased  231.928 °C 
5946  Mini Freezing Point of Zinc, Metal Cased  419.527 °C 
5947 Mini Freezing Point of Aluminum, Metal Cased 660.323 °C

 

Maintainance apparatus

Model  Features/Use 
7012  Maintains: triple point of water and gallium cells.
Comparisons: –10 °C to 110 °C. 
7037  Maintains: triple point of water and gallium cells.
Comparisons: –40 °C to 110 °C. 
7312  Maintains: two TPW cells. Compact size, runs quietly.
Comparisons: –5 °C to 110 °C. 
7341  Maintains: triple point of mercury cell.
Comparisons: –45 °C to 150 °C. 
9210  Maintains: mini triple point of water.  
Comparisons: –10 °C to 125 °C. 
9230  Maintains: stainless steel gallium cell.
Comparisons: 15 °C to 35 °C. 
9260  Maintains: indium, tin, zinc, and aluminum cells.
Comparisons: 50 °C to 680 °C. 
9114  Maintains: indium, tin, zinc, and aluminum cells.
Comparisons: 100 °C to 680 °C. 
9115  Maintains: aluminum and silver cells.
Comparisons: 550 °C to 1000 °C. 
9116  Maintains: aluminum, silver, gold, and copper cells.
Comparisons: 400 °C to 1100 °C. 
9117  Anneals SPRTs, HTPRTs, and thermocouples to 1100 °C.
Protects them against contamination from metal ions. 

Boiling point of liquid nitrogen 

7196 Affordable substitute for a triple point of argon system. Provides for low-temperature comparison calibrations at approximately –196 °C with uncertainties of 2 mK. 

Resistance bridge 

1595A 0.06 ppm accuracy for calibration of SPRTs and thermistors. 

Standard resistors 

742A  Excellent performance without oil or air baths. Values from 10 ohm to 100 megohm. 
5430  Highest stability oil-filled resistors (< 2 ppm/year drift). AC cal uncertainty to 3 ppm. 

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